The late preservationist James “Jimmy”
Biddle lived in this 6,200-square-foot home near DC’s American University. It's now home to his ex-wife Louisa and her husband, former ambassador Robert Duemling. Photograph via Google Earth.

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Robert and Louisa Duemling

$14.2 million, Kent

When he wasn’t restoring his family’s 19th-century estate near
Philadelphia, the late preservationist James “Jimmy”
Biddle lived in this 6,200-square-foot home near DC’s American
University. Biddle, who died in 2005, was president of the National Trust
for Historic Preservation, where he helped save such landmarks as New York
City’s Grand Central Terminal and the exterior of the US Capitol. He also
advised First Ladies Jackie Kennedy and Lady Bird
Johnson on historic furniture.

According to campaign-donation records, the six-bedroom,
seven-bath house is now home to Biddle’s ex-wife, Louisa, and her husband,
former ambassador Robert Duemling. The estate’s six acres are likely
brimming with flora and fauna—Louisa was on the board of the Nature
Conservancy for nine years.